Metalliferous azo dyestuffs



2,936,304 METALLIFEROUS AZO DYESTUFF S Reinhard Neier, Basel, and Walter Wehrli, Riehen, near Basel, Switzerland, assignors to Sandoz A.G., Basel, Switzerland No Drawing. Application December 17, 1956 Serial No. 628,554

Claims priority, application Switzerland December 23, 1955 3 Claims. (Cl. 260-151) The present invention relates to a group of metalliferous azo dyestuffs which correspond to the formula ru-o o The process for the wherein production of the new metalliferous azo dyestuffs consists in coupling 1 mol of the diazo compound of a 2-amino-l-hydroxybenzene of the general formula SOz-R wherein R has the aforenamed significance and the benzene nucleus may contain further non-ionic substituents commonly present in azo dyestuffs, with lmol of a l-hydroxy-4-alkoxynaphthalene Whose alkyl radical may contain such non-ionic substituents as commonly found in azo dyestuffs, and treating the resulting monoazo compound with a metal yielding agent, preferably chromium or cobalt yielding agent, in such a way that a metalcontaining dyestulf is produced which contains essentially one metal atom in complex combination withtwo molecules of the monoazo compound.

The coupling of the diazotized Z-amino-l-hydroxybenzenes of general Formula 2 with the l-hydroxy-4-alkoxynaphthalenes conforming to the present definition is best conducted in a weakly alkaline to alkaline medium and preferably in the presence of pyridine. The monoazo compounds thus formed are precipitated from the coupling mass by means of salt and subsequently filtered ofi.

Examples of diazo components particularly suitable for the present process are Z-amino-l-hydroxy-4methylsulfonylbenzene, Z-amino-l-hydrcxybenzene-4- or -,5-sulfonic acid amide, Z-amino-l-hydroxy-6-chlorobenzene-4 sulionic acid amide, Z-amino-l-hydroxy-6-methylbenzene-4- 2,936,304 Patented May 10, 1960 sulfonic acid amide, 2amino-1-hydroxy-4-chlorobenzene- 5- or -6-sulfonic acid amide and 2-amino-l-hydroxy-4- methylbenzene-S- or -6-sulfonic acid amide. The 2- amino-l-hydroxybenzene sulfonic acid amides may be further substituted on the nitrogen atom of the sulfonic acid amide group, referably by alkyl, hydroxyalkyl, alkoxyalkyl, cycloalkyl, aralkyl and/or aryl radicals. Preferred representatives of such Z-amino-l-hydroxybenzene sulfonic acid amides are Z-amino-l-hydroxybenzene-4- or -5-sulfonic acid methylamide, ethylamide, -(2'- hydroxy)-ethylamide, -(2'-hydroxy)-propylamide, -(3- meth oxy)-propylamide and Z-amino-1-hydroxybenzene-4- or -5-sulfonic acid-di-[ (2-hydroxy) -ethyl]-amide. In the dialkylated sulfonic acid amide groups two alkyl groups may be combined with each other by a simple carbon linkage or cyclically through an oxygen atom. Representatives of this class of compounds are the 2-amino-1- hydroxybenzene-4- or -5-sulfonic acid pyrrolidides and morpholides.

As azo components 1-hydroxy-4-methoxynaphthalene and l-hydroxy-4-ethoxynaphthalene are of primary importance.

The conversion of the monoazo compounds into their metal complexes is effected preferably with chromium or cobalt compounds. Metallization is carried out to advantage in aqueous solution or in an organic medium, for example formamide, or in the concentrated aqueous solution of an alkali-metal salt of a low molecular aliphatic monocarboxylic acid. It is advantageous to proportion the amount of metal-yielding agent so that less than two but at least one atom of metal acts upon two molecules of the monoazo compound.

Suitable chromium compounds are e.g chromic fluoride, chromic sulfate, chromic formate, chromic acetate, potassium chromic sulfate and ammonium chromic sulfate. The chromates also, for example sodium or potassium chromate or bichromate, are very'suitable for metallizing the monoazo compounds. When the latter are chosen it is of advantage to work in a strongly caustic alkaline medium with additions of reducing substances if desired.

monocarboxylic acid, for example cobalt hydroxide or cobalt carbonate, may also be employed.

It is particularly advantageous to conduct the metallization in an aqueous or alkaline medium with the metal compounds added in the presence of compounds which maintain the metals dissolved in complex combination in a caustic alkaline medium, e.g. tartaric, citric o-r lactic acid.

The metal-complex compounds thus obtained are precipitated from aqueous medium by the addition of salt,

if necessary, and finally dried.

The new metalliferous azo dyestuffs conforming to the present definition are metal-complex compounds containing essentially 1 atom of metal in combination with 2 molecules of a monoazo compound. The metal complex compounds are so-called 1:2 complexes in which 1 molecule of the monoazo compound is joined to approximately 0.3 to 0.7 of an atom of metal. The new dyestuffs dye wool, silk, leather and synthetic polyamide fibers from neutral or weakly acid baths in blue shades which are fast to light, washing, milling and perspiration. They are also suitable for dyeing man-made fibers which are subsequently spun from organic solvents and for pig 'menting' lacquers and plastics of every description.

The following examples illustrate the invention. All parts and percentages specified therein are by weight; the temperatures are given in degrees centigrade.

EXAMPLE 1 4 EXAMPLE 3 20.2 parts of 2-amino-1-hydroxybenzene-5-sulfonic acid methylamide are diazotized with 6.9 parts of sodium 5 nitrite in 17 parts of hydrochloric acid 30% and 100 parts 22.3 parts of Z-amino-l-hydroxy-4-chlorobenzene-S- of water with ice addedfor cooling. The diazo solusulfonic acid amide are diazotized with 6.9 parts of sodium tion at 05 is poured into a solution of 17.4 parts of 1- nitrite in an ice-cooled solution of 17 parts of hydrohydroxy-4-methoxynaphthalene, 6 parts of'sodium hychloric acid 30% and 100 parts of water The diazo droxide, 4 parts of sodium carbonate and 150 parts of solution at 0-5 is then run into a solution of 17.4 parts 10 water. As soon as formation of the monoazo compound of 1-hydroxy-4-methoxynaphthalene, 8 parts of sodium is complete, it is precipitated from the coupling mass with hydroxide and 150 parts of water. As soon as formation sodium chloride, then filtered ofi and dried. of the monoazo compound is complete, it is precipitated For converting into the chromium complex compound from the coupling mass with sodium chloride, filtered and 19.4 parts of the monoazo compound are stirred into dried. 400 parts of water. The suspension is given 125 parts of For converting into the cobalt complex compound, 20.4 an aqueous solution of sodium 2-hydroxy-benzoate conparts of the monoazo compound are dissolved with 3 taining 1.5 parts of chromium in complex combination, parts of sodium hydroxide in 400 parts of water at 60 C. and the whole is boiled with reflux until chromation is A mixture of 7.1 parts of crystallized cobaltous sulfate, completed. The chromiferous azo dyestufi is precipitated 2.8 parts of sodium hydroxide and 63 parts of a 3% from the metallizing mass by an addition of sodium aqueous solution of tartaric acid are added to the solution. chloride, dried and ground. It is a dark powder which After the mass has been stirred for half an hour the dyes wool, silk, leather and synthetic polyamide fibers in cobaltiferous azo dyestufi so formed is precipitated with greenish blue shades. sodium chloride, filtered ofi, dried and ground. It is a dark powder which dyes wool, silk, leather and synthetic EXAMPLE 4 polyamide fibers from a neutral to weakly acid dyebath in blue f 26.4 parts of 2-amino-1-hydroxybenzene-S-sulfonic acid The dyelng Procedure 15 as follows: phenylamide are diazotized with 6.9 parts of sodium nitrite 1 part of Gla'ubers salt and 0.2 part of the cobaltiferous in 20 parts f hydrochloric i and 200 parts f dyestuff q d accoldmg to the Pmsent example 30 water with ice added for cooling. The diazo suspension are dlssolved H1 500 Parts of Watef- P of at 0-5 is poured into a solution of 17.4 parts of l- Wetted wool are entered into the dye-bath at 30, which is hydroxy 4-methoXYnaPhthalehe, 8 parts of sodium K heated to in 15 fninutes maintained, droxide, 150 parts of water and 50 parts of pyridine. As thls temperature 60 mmutes- P f dyemg soon as the formation of the monoazo compound is'com process 0.2 part of concentrated acetic acid rs gradually Plated it i precipitated from h coupling mass i h added to the dyebath. On completion of dyeing the sodium Chloride then filt d ff d d i d bright blue wool dyeing is rinsed with water and dried. In order to convert the monoazo compound i h Synthetic polyamide fibers are dyed on similar lines. chromium complex compound 25 parts of it i 4 511k 15 y at 3 Somewhat lower temperature, 46 parts of sodium hydroxide are dissolved in 700 parts of water. After the addition of 4.5 parts of sodium. bi-

EXAMPLE chromate and 6.5 parts of glucose the mass is boiled 20.4 parts of the metal-free monoazo compound ob with refiux until the metal-free monoazo compound is tainable according to Example 1 are converted into the no longer indicated. The chromiferous monoazocomchromium complex compound by heating with 14 parts pound thus formed is precipitated from the metallizing of potassium chromic sulfate in 100 parts of formamide solution by the addition of sodium chloride and is then at 100 until metallization is completed. The chromium filtered oft, dried and ground. It is a dark powder which complex compound is precipitated by diluting the mass dyes wool, silk, leather and synthetic polyamide fibers with 200 parts of a concentrated sodium chloride solufrom aneutral to weakly acid bath in greenish blue shades. tion and is then filtered olf. The filter cake-is dissolved In the following tablefurther examples are enumerated by stirring in a dilute aqueous sodium hydroxide solution. 50 whose method of producetion corresponds to those of The dyestufi is again precipitated from the solution by the preceding examples. The resultant metalliferous azo the addition of sodium chloride, filtered off and dried. dyestuffs are characterized by their diazo and azo com- The purified chromiferous azo dyestuff is a dark powder ponents (columns (II) and (III)), the metal (column which dyes wool, silk, leather and synthetic polyamide (IV)) and the shade of the dyeings obtained with them fibers in greenish blue shades. on wool (column (V)).

Table x mp V) W) 5 'gfi g bggggf }1-hydroxy-i-methoxynapbthalene... ggfgg gi 6 2-famino-l-hydroxybenzene-4-sul- {Cr blue-gray.

onlc acid methylamide. Co violet-gray. 7 2-farnino-liydrofirylenzened-sul d Cr mue gray 2. 6 y y {Co violet-gray. 8 2 522. 55}rii iiiiifipiofiii. ..do {g3 g gs- 9 2gmin?-1-hydroxy-4-chlorobenzoneundo {Cr green-blue. 10 2..;iiin% i-i%f3ii?ssn- 212 13 acid-(2'-hydroxy)-ethyl- -'.do n 'g gfigggfgimgg }1-hydroxy-4-ethoxynnphthalenefiffi' 12 dn 1-hydroxy-4-n-propoxynaphthaleneu f n do l -hydroxy-i-(2-methyl)-propoxy- {Cr green-blue. naphthalene. Co a. 4 an l-hydroxyt-(2'-ethoxy)-ethoxy- Cr green-blue.

naphthalene. 00 blue.

R represents a member selected from the group consisting of a lower alkyl radical, an amino group, a lower alkylamino group, a di-(lower alkyl)-amino group, a

lower hydroxyalkyl-amino group, a lower alkoxyalkylamino group, a mononuclear arylammo group, and the morpholyl group,

R represents a member selected ,from the group consisting of a lower alkyl radical, and

M represents a member selected from the group consisting of a chrominum and a cobalt atom.

2. The cobaltiferous azo dyestufi which corresponds to the formula A alkyl radical and a lower alkoxy- 4 moo 3. The cobaltiferous azo dyestufl which corresponds to the formula H0 -HACr-HN- V References Cited in the file of this patent V UNITED STATES PATENTS I Jan. 22, 1957 Printing," 1948,page 214.

Fierz-David and Blangley: Fundamental Processes of Dye Chemistry, 1949, page 252.

UNITED STATES PATENT OFFICE CERTIFICATION OF CORRECTION Patent No. 2,936,304 May 10, 1960 Reinhard Neier et al,.

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the grant (only) line 1, name of second inventor, for

"Walter Wehril" read Walter Wehrli in the printed speci fication, column 4, line 50, for ."producetion" read production column 7, line 11, for "chrominum" read chromium a Signed and sealed this 9th day of May 1961.

(SEAL) Attest:

ERNEST W, SWIDER Attcsting Officer DAVID La LADD Commissioner of Patents 

1. A METALLIFEROUS AZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA 